1921304839145 has 8 divisors (see below), whose sum is σ = 2385068076360. Its totient is φ = 1484042358400.

The previous prime is 1921304839133. The next prime is 1921304839147. The reversal of 1921304839145 is 5419384031291.

It can be written as a sum of positive squares in 4 ways, for example, as 75152191321 + 1846152647824 = 274139^2 + 1358732^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1921304839145 - 2⁸ = 1921304838889 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1921304839093 and 1921304839102.

It is not an unprimeable number, because it can be changed into a prime (1921304839147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6625188956 + ... + 6625189245.

It is an arithmetic number, because the mean of its divisors is an integer number (298133509545).

Almost surely, 2^{1921304839145} is an apocalyptic number.

It is an amenable number.

1921304839145 is a deficient number, since it is larger than the sum of its proper divisors (463763237215).

1921304839145 is a wasteful number, since it uses less digits than its factorization.

1921304839145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13250378235.

The product of its (nonzero) digits is 933120, while the sum is 50.

The spelling of 1921304839145 in words is "one trillion, nine hundred twenty-one billion, three hundred four million, eight hundred thirty-nine thousand, one hundred forty-five".